VIERA, Fla. — Washington Nationals pitcher Gio Gonzalez says he has cooperated with a Major League Baseball investigation surrounding a Miami clinic where his name was reported to have shown up in records for performance-enhancing drugs.

He reiterated he's never taken them.

Gonzalez spoke Tuesday about the allegations after reporting to the Nationals' spring training facility in Viera, Fla., saying he feels confident he'll be exonerated.

He says he's been given no timetable from baseball about when the results of the investigation will be completed, but added he doesn't want it to be a distraction for his team following its first playoff appearance.

Gonzalez says he's shifted his focus to the upcoming World Baseball Classic after his recent selection to pitch for Team USA.